circumlocution

/ˌsərkəmˌləˈkyo͞oSH(ə)n/
noun

1. the use of many words where fewer would do, especially in a deliberate attempt to be vague or evasive

He shuddered at his own craven circumlocution, using so meaningless a word to obscure so hideous a truth.

– Laini Taylor, Strange the Dreamer